I just thought "what the hell".Either i messed up terribly with levling my chars in the chapters before (all ~lv10) or IT IS ridiculous hard.I mean i got to the first Snail-creature and then half of my chars are killed by the Blizzard-Attack, and then the Time almost ran out (~1500 left)(and im not battling the creatures at the start. i just ran past them)

Have Firrus store Yellow Essence then cast Wilos on himself, then have him run past everyone and cast Wilus on the snail wizards to stop them from using magic while still proceeding to the east. You only need to get one character to the east section to win the stage.